QNX 4.25 TCP/IP on a PC104 Stack

I am running realtime applications using short interactive commands through the QNX 4.25 system loaded onto a PC104 stack. The TCP protocol is blocking up successive comands and firing them all at once. The commands must go out immediatley. I have tried setting socket attributes to NO_DELAY both before and after connecting with no difference. We treat the connection as a Stream INET type.

Has anyone heard of this problem and solved it?